402241956509 has 2 divisors, whose sum is σ = 402241956510. Its totient is φ = 402241956508.

The previous prime is 402241956419. The next prime is 402241956517. The reversal of 402241956509 is 905659142204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393517836100 + 8724120409 = 627310^2 + 93403^2 .

It is a cyclic number.

It is not a de Polignac number, because 402241956509 - 2²⁰ = 402240907933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402241956559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201120978254 + 201120978255.

It is an arithmetic number, because the mean of its divisors is an integer number (201120978255).

Almost surely, 2^402241956509 is an apocalyptic number.

It is an amenable number.

402241956509 is a deficient number, since it is larger than the sum of its proper divisors (1).

402241956509 is an equidigital number, since it uses as much as digits as its factorization.

402241956509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 402241956509 in words is "four hundred two billion, two hundred forty-one million, nine hundred fifty-six thousand, five hundred nine".